| The continuous advancement and wide application of electronic equipment has made the artificial electromagnetic energy caused by space continue to increase.A lot of electromagnetic noise propagates in space in the form of electromagnetic fields,and the electromagnetic environment is becoming more and more complicated.In order to ensure the normal operation of electronic equipment in a complex electromagnetic environment,it is necessary to improve the level of anti-electromagnetic interference of the equipment itself,that is,to develop and improve electromagnetic interference suppression technology.This article takes the high-pressure discharge system in the actual project as the research object,and studies the modeling and filtering suppression method of the conducted electromagnetic interference of the high-pressure discharge system.The main contents are as follows:(1)Establishment of simulation model of high-voltage discharge system and analysis and determination of electromagnetic interference.First,the components of the system and the working principle are introduced.Then combined with the three elements of electromagnetic compatibility,the mechanism of electromagnetic interference in the system is analyzed and determined.Then according to the system structure characteristics and working principle,combined with the algorithm characteristics and application scope of each simulation software,CST was selected as the simulation software in this study,and the field line coupling simulation model of the system was established.Finally,the coupling calculation of the field line co-simulation was started,and the radiated and conducted EMI in the system was obtained.It was confirmed that the ground crosstalk conducted EMI is the main electromagnetic interference in the system,and the mechanism of the effect of the ground crosstalk on the circuit interference was analyzed.At the same time,combined with the actual situation of the system,the power conversion circuit was selected as the disturbed circuit in the system simulation.(2)Research on the establishment of diode SPICE model and construction,simulation and analysis of disturbed circuits.The method of establishing the diode SPICE model is studied,the SPICE simulator and the SPICE model are introduced in detail,the model parameters required to establish the diode SPICE model are analyzed,and then a fast recovery rectifier diode of type 2CZ106 is taken as an example.The establishment method and steps of diode SPICE model are introduced,and the SPICE model of 2CZ106 is established.It is applied to the construction of the disturbed circuit,the construction of the disturbed circuit is completed,and finally the affected circuit is affected by electromagnetic interference.The working status was simulated and analyzed.(3)Research on suppression methods of conducted electromagnetic interference filtering.A filtering method for conducted electromagnetic interference based on the frequency characteristics of capacitance is proposed.The frequency characteristics of the capacitor are introduced,and the working principle of the capacitor in the filter circuit is analyzed.Finally,combining the frequency characteristics of the capacitor with the filtering principle,an accurate filtering method is proposed,that is: first the Fourier transform is performed on the extracted crosstalk signal to obtain the energy distribution spectrum diagram of the crosstalk signal;then according to the figure The energy distribution of the interference signal is analyzed to find the main frequency point;finally,the optimal filtering capacitor value is derived through the calculation formula of the capacitor impedance.The simulation results show that the method has good filtering effect and the interference signal is effectively suppressed. |
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